linux-kernel - Re: [PATCH v3 2/4] remoteproc: add a rproc ops for performing address translation

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Message-ID: <CAK=WgbaSD9tGVKhUkbL3JjtW9GuAR_fbWHG6rx1m_v9TDW0Osw@mail.gmail.com>
Date:	Sat, 9 May 2015 10:54:18 +0300
From:	Ohad Ben-Cohen <ohad@...ery.com>
To:	Dave Gerlach <d-gerlach@...com>
Cc:	linux-arm <linux-arm-kernel@...ts.infradead.org>,
	"linux-kernel@...r.kernel.org" <linux-kernel@...r.kernel.org>,
	"linux-omap@...r.kernel.org" <linux-omap@...r.kernel.org>,
	"devicetree@...r.kernel.org" <devicetree@...r.kernel.org>,
	Suman Anna <s-anna@...com>, Kevin Hilman <khilman@...aro.org>,
	Tony Lindgren <tony@...mide.com>
Subject: Re: [PATCH v3 2/4] remoteproc: add a rproc ops for performing address translation

Hi Dave,

On Wed, Apr 1, 2015 at 10:37 PM, Dave Gerlach <d-gerlach@...com> wrote:
> From: Suman Anna <s-anna@...com>
>
> The rproc_da_to_va API is currently used to perform any device to
> kernel address translations to meet the different needs of the remoteproc
> core/drivers (eg: loading). The functionality is achieved within the
> remoteproc core, and is limited only for carveouts allocated within the
> core.
>
> A new rproc ops, da_to_va, is added to provide flexibility to platform
> implementations to perform the address translation themselves when the
> above conditions cannot be met by the implementations. The rproc_da_to_va()
> API is extended to invoke this ops if present, and fallback to regular
> processing if the platform implementation cannot provide the translation.
> This will allow any remoteproc implementations to translate addresses for
> dedicated memories like internal memories.

Can you please provide specific examples where this is needed and how
it is going to be used?

Thanks,
Ohad.
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